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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 43 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.44² =
  2. 2.46² =
  3. 3.43² =
  4. 4.39² =
  5. 5.89² =
  6. 6.71² =
  7. 7.94² =
  8. 8.69² =
  9. 9.41² =
  10. 10.47² =
  11. 11.32² =
  12. 12.91² =
  13. 13.86² =
  14. 14.85² =
  15. 15.61² =
  16. 16.79² =
  17. 17.77² =
  18. 18.56² =
  19. 19.52² =
  20. 20.68² =
  21. 21.33² =
  22. 22.54² =
  23. 23.78² =
  24. 24.38² =
  25. 25.49² =
  26. 26.66² =
  27. 27.99² =
  28. 28.59² =
  29. 29.51² =
  30. 30.75² =
  31. 31.74² =
  32. 32.48² =
  33. 33.58² =
  34. 34.97² =
  35. 35.81² =
  36. 36.31² =
  37. 37.76² =
  38. 38.57² =
  39. 39.34² =
  40. 40.37² =

Answer key

  1. 1936
  2. 2116
  3. 1849
  4. 1521
  5. 7921
  6. 5041
  7. 8836
  8. 4761
  9. 1681
  10. 2209
  11. 1024
  12. 8281
  13. 7396
  14. 7225
  15. 3721
  16. 6241
  17. 5929
  18. 3136
  19. 2704
  20. 4624
  21. 1089
  22. 2916
  23. 6084
  24. 1444
  25. 2401
  26. 4356
  27. 9801
  28. 3481
  29. 2601
  30. 5625
  31. 5476
  32. 2304
  33. 3364
  34. 9409
  35. 6561
  36. 961
  37. 5776
  38. 3249
  39. 1156
  40. 1369

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